<template>
  <view>
    <!-- 使用自定的搜索组建 -->
    <my-search @click="gotoSearch"></my-search>
      <view class="scroll-view-container">
        <!-- 左侧滚动视图区 -->
       <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
         <block v-for="(item, i) in cateList" :key="i">
         <view  :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
         </block>
       </scroll-view>
        <!-- 右侧滚动视图区 -->
        <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
          <view v-for="(item2, i2) in cateLevel2" :key="i2" class="cate-lv2">
            <!-- 二级分类标题 -->
            <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
            <!-- 三级分类列表 -->
            <view class="cate-lv3-list">
              <!-- 三级分类的项 -->
              <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                <!-- 三级分类的图片 -->
                <image :src="item3.cat_icon"></image>
                <!-- 三级分类的文本 -->
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
          </view>
        </scroll-view>
      </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        cateList: [],
        //二级分类列表
        cateLevel2: [],
        active: 0,
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      //获取分类列表数据
      async getCateList() {
        const { data: res } = await uni.$http.get('/api/public/v1/categories')

        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i) {
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active {
        background-color: #FFFFFF;
        position: relative;
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
  
}

</style>
